Very bad OpenGL performance on i915

[Alan Hourihane]

On Tue, 2005-09-27 at 15:11 +0300, İsmail Dönmez wrote:
> Hi,
> 
> I installed latest xorg from cvs yesterday and loaded drm,dri,i915 etc but 
> glxgears gives me only ~260 fps which seems to be really low for a card with 
> a 128mb RAM.
> 
> Here is the lspci output :
> 
> 0000:00:02.0 VGA compatible controller: Intel Corporation Mobile 
> 915GM/GMS/910GML Express Graphics Controller (rev 03) (prog-if 00 [VGA])
>         Subsystem: Sony Corporation: Unknown device 81b8
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
>         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 16
>         Region 0: Memory at b0080000 (32-bit, non-prefetchable)
>         Region 1: I/O ports at 1800 [size=8]
>         Region 2: Memory at c0000000 (32-bit, prefetchable) [size=256M]
>         Region 3: Memory at b0040000 (32-bit, non-prefetchable) [size=256K]
>         Capabilities: [d0] Power Management version 2
>                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> 
> 
> Any idea what might be wrong? Also I can't get screen to refresh > 60 Hz. Is 
> that expected?

There's two things to check.

1. /var/log/Xorg.0.log for any information relating to DRI.

2. Run glxinfo and see if you are getting 'direct rendering'.

Alan.